I think by Third World you mean developing countries. Eastern Europe has Belgrade, Kiev, Zagreb, Prague, Vienna, Warsaw, Sofia, Budapest, Bratislava...quite developed. And Asia comprises a third of the world's landmasses and includes global economic hubs and megacities. As such, it shouldn't be generalized. But even if you were traveling through a developing nation in sub-Saharan Africa and happened to have a catastrophic wheel failure, you would make it work. At worst you would have to wait a few days (and pay some extra cash) for your friends at FedEx to bring you a new rim.

Side note from an historian: Third World was a term created during the Cold War to refer to countries not aligned with either the Soviet Union and its communist allies or the United States and its democratic allies. The United States, Western Europe, and their allies were referred to as the First World. Soviet Union, China, and their allies were the Second World. Those left over were the Third World. But alas, the Cold War has been over for decades and the term is outdated.